<ninja> Let ninja use the Visual C++ binary from PATH

The previous logic led to problems when running 64 bit
builds in a native 64 bit shell as the cross compiler
was always given priority.

Change-Id: Id6a29147c461e8542f65a568ff5956d4fdb3c642
Reviewed-by: Zeno Albisser <zeno.albisser@digia.com>

ninja/bootstrap.py

@@ -93,14 +93,6 @@ if platform.is_windows():
 
 if platform.is_msvc():
     cl = 'cl'
-    vcdir = os.environ.get('VCINSTALLDIR')
-    if vcdir:
-        if options.x64:
-            cl = os.path.join(vcdir, 'bin', 'x86_amd64', 'cl.exe')
-            if not os.path.exists(cl):
-                cl = os.path.join(vcdir, 'bin', 'amd64', 'cl.exe')
-        else:
-            cl = os.path.join(vcdir, 'bin', 'cl.exe')
     args = [cl, '/nologo', '/EHsc', '/DNOMINMAX']
 else:
     args = shlex.split(os.environ.get('CXX', 'g++'))